Class 2 Serial Data Line

WARNING: This page is about a different car, the 2004 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

A total list of the control modules on the class 2 serial data line can include the following:

The audio amplifier
The cellular telephone module w/UV8
The dash integration module (DIM)
The digital radio receiver
The driver door module (DDM)
The driver door switch assembly (DDSA)
The electronic brake control module (EBCM)
The electronic suspension control module (ESC)
The front passenger door module (FPDM)
The inflatable restraint sensing and diagnostic module (SDM)
The instrument panel cluster (IPC)
The instrument panel integration module (IPM)
The HVAC control module - auxiliary
The left middle door module (LMDM) w/V4U
The left rear door module (LRDM)
The memory seat module (MSM) w/A45
The powertrain control module (PCM)
The radio
The rear integration module (RIM)
The remote control door lock receiver (RCDLR)
The remote playback device CD changer
The right middle door module (RMDM) w/V4U
The right rear door module (RRDM)
The steering column module
The theft deterrent control module
The vehicle communication interface module (VCIM)
The window switch - front passenger w/armored car

The class 2 serial data line is a ring/star configuration with discrete circuits entering and leaving each module. This allows communications to the modules on the ring portion of the class 2 serial data circuit if one of the 2 discrete circuits is open. The following modules are on the ring portion of the class 2 serial data circuit. Therefore if there is an open in the class 2 serial data circuit communication will still occur:

The dash integration module (DIM)
The digital radio receiver
The electronic brake control module (EBCM)
The inflatable restraint sensing and diagnostic module (SDM)
The instrument panel cluster (IPC)
The instrument panel integration module (IPM)
The powertrain control module (PCM)
The radio
The remote playback device CD changer

The following modules are connected to the star portion of the class 2 serial data circuit by splice packs and have only one communication line connection to the class 2 serial data circuit. Therefore if the class 2 serial data line is open to any of these modules communication will not occur:

The audio amplifier
The cellular telephone module w/UV8
The driver door module (DDM)
The driver door switch assembly (DDSA)
The electronic suspension control module
The front passenger door module (FPDM)
The HVAC control module - auxiliary
The left middle door module (LMDM) w/V4U
The left rear door module (LRDM)
The memory seat module (MSM) w/A45
The rear integration module (RIM)
The remote control door lock receiver (RCDLR)
The right middle door module (RMDM) w/V4U
The right rear door module (RRDM)
The steering column module w/N37
The theft deterrent control module
The vehicle communication interface module (VCIM)
The window switch - front passenger w/armored car